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Field-emission gun scanning electron microscopy (FEG-SEM) images of MNPs bound onto GMR sensors after test. (A) Biotin-BSA positive control; (B) 1.0 × 104 TCID50/mL virus; (C) 1.0 × 103 TCID50/mL virus; (D) 2.0 × 102 TCID50/mL virus; (E) BSA negative control.
